Load Specifications
Load data in caliber .270 Win. with .277 | 125gr | Peregrine VLR-4 bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, Hodgdon Superformance and Alliant Reloder-17.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 54,317 psi | 87% | 2874 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,159 psi | 90% | 2949 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,289 psi | 90% | 2943 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,940 psi | 88% | 2966 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,202 psi | 90% | 2949 fps | 96.8% |
| Accurate 4064 | <<locked>> | 92% | 56,130 psi | 90% | 2989 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 52,866 psi | 85% | 3022 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 86% | 53,737 psi | 86% | 2979 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 54,940 psi | 88% | 2979 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,275 psi | 90% | 2982 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,345 psi | 86% | 2904 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,505 psi | 86% | 3097 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,650 psi | 88% | 2999 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,143 psi | 88% | 3018 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,592 psi | 88% | 3087 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,637 psi | 89% | 3123 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,609 psi | 62% | 2792 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,207 psi | 69% | 2956 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,490 psi | 86% | 2989 fps | 99.4% |
| Bofors RP3 | <<locked>> | 92% | 55,347 psi | 89% | 3015 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,317 psi | 89% | 2979 fps | 96.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,447 psi | 87% | 2913 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,550 psi | 89% | 3009 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,838 psi | 86% | 3054 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 92% | 56,347 psi | 90% | 3028 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 98% | 56,202 psi | 90% | 3081 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 86% | 54,259 psi | 87% | 2989 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,575 psi | 81% | 2953 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,751 psi | 86% | 3022 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,258 psi | 85% | 3054 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,404 psi | 57% | 1844 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,564 psi | 89% | 2989 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,099 psi | 87% | 2972 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,201 psi | 87% | 2959 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,201 psi | 87% | 2933 fps | 97.2% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,970 psi | 90% | 3009 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,041 psi | 87% | 2959 fps | 97.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,519 psi | 86% | 3015 fps | 99.4% |
| IMR 4895 | <<locked>> | 88% | 53,301 psi | 85% | 2999 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 56,275 psi | 90% | 2982 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,420 psi | 90% | 2966 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,214 psi | 85% | 2953 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,330 psi | 86% | 2904 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 53,867 psi | 86% | 2956 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,330 psi | 86% | 2953 fps | 98.3% |
| Lovex S070 | <<locked>> | 98% | 54,114 psi | 87% | 2986 fps | 97.5% |
| Norma 201 | <<locked>> | 88% | 55,593 psi | 89% | 2972 fps | 100% |
| Norma 202 | <<locked>> | 86% | 52,852 psi | 85% | 2923 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,317 psi | 87% | 3002 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 55,825 psi | 90% | 3068 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 55,143 psi | 88% | 3031 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,520 psi | 87% | 3061 fps | 98.2% |
| Ramshot TAC | <<locked>> | 84% | 53,113 psi | 85% | 2943 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,362 psi | 90% | 3022 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,519 psi | 86% | 2927 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,679 psi | 57% | 1883 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,651 psi | 89% | 2959 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,113 psi | 85% | 2949 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,825 psi | 90% | 3091 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,506 psi | 89% | 3127 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 52,634 psi | 84% | 3041 fps | 99.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,420 psi | 90% | 3136 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 84% | 52,997 psi | 85% | 2904 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,188 psi | 90% | 2969 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,201 psi | 89% | 3005 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,317 psi | 89% | 2979 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,330 psi | 86% | 2953 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,214 psi | 85% | 2953 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 53,867 psi | 86% | 2956 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,114 psi | 87% | 2986 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,621 psi | 86% | 3015 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,042 psi | 88% | 2976 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,637 psi | 89% | 2999 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,114 psi | 87% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,157 psi | 87% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,534 psi | 86% | 2904 fps | 97.1% |
| Somchem S321 | <<locked>> | 82% | 53,838 psi | 86% | 2959 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,359 psi | 86% | 2861 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,534 psi | 87% | 2966 fps | 99.8% |
| Somchem S355 | <<locked>> | 94% | 55,361 psi | 89% | 3002 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,111 psi | 80% | 3015 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 53,679 psi | 86% | 2828 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,404 psi | 87% | 2851 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,999 psi | 90% | 2933 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,388 psi | 86% | 2900 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,606 psi | 86% | 2933 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,781 psi | 88% | 3012 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 84% | 53,171 psi | 85% | 2927 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,143 psi | 88% | 2946 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,592 psi | 86% | 3009 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,221 psi | 68% | 2874 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,216 psi | 89% | 2989 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 52,982 psi | 85% | 2976 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,202 psi | 90% | 3081 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,374 psi | 55% | 2776 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,796 psi | 89% | 3012 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 47,747 psi | 77% | 2776 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,605 psi | 84% | 2897 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,176 psi | 64% | 2687 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,718 psi | 77% | 2854 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 49,052 psi | 79% | 2828 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 38,043 psi | 61% | 2677 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 37,043 psi | 59% | 2717 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 44,135 psi | 71% | 2805 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 37,681 psi | 60% | 2648 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,296 psi | 74% | 2818 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 46,601 psi | 75% | 2805 fps | 100% |
| Alliant Power Pro 2000-MR | 46.2 gr | 80% | 40,379 psi | 65% | 2831 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,028 psi | 59% | 2667 fps | 98% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,827 psi | 64% | 2733 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,925 psi | 56% | 2674 fps | 95% |
| Alliant Reloder-17 | 45.5 gr | 80% | 32,082 psi | 51% | 2625 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,879 psi | 51% | 2618 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 37,434 psi | 60% | 2818 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,511 psi | 70% | 2805 fps | 97.8% |
| Bofors RP3 | <<locked>> | 80% | 36,593 psi | 59% | 2667 fps | 98% |
| Bofors RP7 | <<locked>> | 92% | 48,805 psi | 78% | 2867 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,196 psi | 77% | 2808 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,295 psi | 73% | 2841 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,053 psi | 80% | 2989 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 80% | 37,623 psi | 60% | 2674 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 92% | 45,658 psi | 73% | 2894 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 44,570 psi | 71% | 2815 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 31,937 psi | 51% | 2562 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,814 psi | 65% | 2785 fps | 98.9% |
| Hodgdon Superformance | 56.5 gr | 94% | 49,501 psi | 79% | 2986 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,179 psi | 42% | 1644 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,931 psi | 69% | 2769 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 44,396 psi | 71% | 2818 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,552 psi | 63% | 2684 fps | 97.4% |
| IMR 4166 Enduron | <<locked>> | 82% | 44,933 psi | 72% | 2766 fps | 95.1% |
| IMR 4350 | <<locked>> | 96% | 49,139 psi | 79% | 2894 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 47,848 psi | 77% | 2851 fps | 95.8% |
| IMR 4831 | <<locked>> | 88% | 35,868 psi | 58% | 2671 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 40,828 psi | 65% | 2766 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 80% | 46,296 psi | 74% | 2818 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 52,518 psi | 84% | 2907 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,395 psi | 70% | 2785 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,425 psi | 71% | 2746 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 39,320 psi | 63% | 2687 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 41,350 psi | 66% | 2730 fps | 95.6% |
| Lovex S070 | <<locked>> | 92% | 44,701 psi | 72% | 2815 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 43,178 psi | 69% | 2756 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 43,511 psi | 70% | 2766 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,175 psi | 63% | 2720 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 37,202 psi | 60% | 2713 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 39,044 psi | 63% | 2736 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 41,872 psi | 67% | 2822 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 46,267 psi | 74% | 2822 fps | 97.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,847 psi | 74% | 2841 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,241 psi | 81% | 2871 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,513 psi | 43% | 1686 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,112 psi | 84% | 2907 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,468 psi | 70% | 2772 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,959 psi | 67% | 2841 fps | 97.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,214 psi | 55% | 2697 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,753 psi | 59% | 2730 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 39,668 psi | 64% | 2805 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 47,065 psi | 75% | 2802 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,075 psi | 66% | 2707 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 34,447 psi | 55% | 2608 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 48,805 psi | 78% | 2867 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,350 psi | 66% | 2730 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,395 psi | 70% | 2785 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,320 psi | 63% | 2687 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 44,701 psi | 72% | 2815 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,476 psi | 57% | 2657 fps | 96.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,556 psi | 71% | 2792 fps | 97.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,699 psi | 68% | 2769 fps | 98.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,715 psi | 72% | 2717 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,130 psi | 60% | 2572 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 46,760 psi | 75% | 2785 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 50,169 psi | 80% | 2900 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,237 psi | 71% | 2713 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,266 psi | 71% | 2789 fps | 98.7% |
| Somchem S355 | <<locked>> | 80% | 35,317 psi | 57% | 2615 fps | 97.1% |
| Somchem S365 | <<locked>> | 82% | 27,209 psi | 44% | 2480 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 50,531 psi | 81% | 2782 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,107 psi | 72% | 2710 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,625 psi | 65% | 2694 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,379 psi | 66% | 2703 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,649 psi | 54% | 2552 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 36,593 psi | 59% | 2667 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 46,470 psi | 75% | 2815 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 39,798 psi | 64% | 2687 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 35,940 psi | 58% | 2664 fps | 95% |
| Vihtavuori N555 | <<locked>> | 94% | 34,330 psi | 55% | 2697 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 31,937 psi | 51% | 2526 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 46,325 psi | 74% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 45,919 psi | 74% | 2897 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 98% | 32,198 psi | 52% | 2707 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,308 psi | 68% | 2776 fps | 98.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 114 powders for .270 Win. loaded with the .277 | 125gr | Peregrine VLR-4. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,844 fps to 3,136 fps. Accurate 3100 gives the best case fill at 100 %, and 114 of the 114 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.277" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .270 Win. with the .277 | 125gr | Peregrine VLR-4 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.